These include an international standard for certification of IT products (software, firmware and hardware) Common Criteria (ISO / IEC 15 408) (CC 2006), official certification adopted by the government from 18 countries. Without security certification, open source tools and applications that are not secure and can not be trusted. Open Source Systems Security Certification urgency to address and analyze the security certification for the security market that makes sense, such as telecommunications, government and military, through case studies provided. This book is designed for professionals and companies are trying to implement Open Source Systems (OSS) are aware of IT governance strategy, and SMEs are looking to attract new markets traditionally held by the product's or to reduce costs.